Over the years, I have seen people put signs up giving away free dirt, but
now when I want some, I don't know where to find it.

I have a long-term need for free "decent" dirt, and by decent I just mean
not filled with trees, concrete, junk, or whatever.

It does not have to be top soil, which I think is the cream of the crop, and
I doubt that would be free anyway.

It has to be delivered, and they can probably dump 100 to 500 huge trucks
worth, and I would still need more for what I want to do.

It's not a critical project, so it's not worth my paying for.
It's also not in a location where many people travel so a sign won't reach
out very far.

If I put an ad in craigslist, I am not sure what to ask for.

Is just 'free dirt' enough?
Or does the type of dirt I want have a name that the people who need to get
rid of theirs needs to know (I don't want junky dirt, for example).